Pinking mechanism



Dec. 9, 1941. W, N, SOBEL E11-AL n 2,265,553

PINKING MECHANISM Filed Feb. l, 1.959 i 2 Shees-Sheet l w/TNESS Brmdf/(4 v .Av-T0 NEY w. N. soBEl. ET AL 1 2,265,553

PINKING MEGHANISM Filed Feb. 1, 1939 2 Sheets-Sheet 2 '/NVENTQRS l Bjrv"Patented Dec. 9, 1941 PINKING MECHANISM William N. Sobel and Herbert V.Jacobs,

Philadelphia, Pa.

Application February 1, 1939,v Serial No. 253,984

8 Claims.

The invention relates to pinking mechanism and involves improved meansfor rendering such mechanism operative and inoperative at will andpositioning the movable cutter blade into and out of cooperativerelation with the stationary cutter blade without interrupting orinterferring with the usual stitching operation of the sewing maychinewith'which the improvement is used. The

inventionA has to do particularly with pinking mechanism of the typewherein a stationary cutter orl ledger blade is positioned adjacent thestitching mechanism of the sewing machine, and the movable cutter bladeis reciprocated relatively to the stationary cutter blade by means of 4apitman structure which receives its reciprocating motion from thedriving mechanism of the sewing machine.

In isome of the pi 'ng devices heretofore used lin combination withsewing machines, no means have been provided forV discontinuing thepinking operation at the will of the operator. It is frequentlydesirable or necessary in a combined stitching and pinking operation todiscontinue the pinking operation during certain portions of thestitchingl operation. In structures where no means are provided forthrowing the pinking device into and out of operation at will, it isnecessary to remove the work from the combined stitching and pinkingmachine so that the stitching .operation alone can be carried out on anindependent machine not equipped with a pinking device. The use ofseparate .machines in this manner is troublesome and expensive.

vIn attempting to overcome the diiculties inherent in machines of thetype referred to, manual means have heretofore been provided foroperatively disconnecting the pinking device from the driving mechanismof the sewing machine. vSuch means have not been satisfactory inoperation, and so far as we are aware no means has been providedheretofore for operatively connecting and disconnecting the pinkingdevice from 'the driving mechanism of the sewing machine where a pitinanstructure or the like is employed gior positively transmitting motion inboth directions from the driving mechanism of the sewing machine to themovable cutter of the pinking device.

The principal object of the present improvement is the provision of asimple coupling device in themotion transmitting means between sewingmachine driving mechanism and a pinking attachment whereby the movablecutter blade of lthe pinking device maybe thrown into and out ofoperation at will, without interfering with the stitching operationperformed by the sewing machine. Other objects and advantages of theimprovement will be apparent from the following description, taken withthe accompanying drawings wherein:

Fig. 1 is a front elevational view of a sewing machine with our improvedpinking device attached thereto, the movable cutter blade and associatedparts being shown in their uppermost position when in use and ourimproved coupling member being shown inoperative condition;

Fig. 2 is an end elevational view, partly cut away, showing our improvedcoupling device with `the parts thereof in position to transmit motionfrom the driving mechanism of the sewing machine to the movable cutterblade of the pinking device;

Fig. 3 is a similar view showing the coupling device with the partsdisconnected; and

Fig. 4 is a rear elevational View of the pinking device with the movablecutter blade and associated parts in their lowermost position of use.

The invention is illustrated in the drawings in combination with asewing machine provided with the usual bed plate or work support I0, astandard II projecting upwardly from one end thereof and having anoverhanging arm I2 extending from its upper end over the bed plate, andprovided with the usual head I3 on its outer end. Power from an electricmotor or other suitable source is applied to the sewing machine by meansof a belt passing over a `driving pulley I4 securedon the outer end ofthe main drive shaft I5. Suitable motion transmitting means on the`opposite end of the drive shaft I5 serves to reciprocate the needle barI6 within the head I3, together with the needle I1 carried thereby. TheWork is held in place yon the work support IIl by a presser foot I8carried by the lower end of a manually operable presser bar I9 supportedin the head I3. The stitching operation is performed by thereciprocating needle I'I, in cooperation with any known `form of feedmechanism and loop-forming mechanism positioned beneath the bed plateI0.

As illustrated in the drawings, our improvementvis incorporated in apinking device having a stationary cutter or ledger blade 20 positionedadjacent the stitch-forming mechanism, and a reciprocating cutter 2Ireceiving its motion from the drive shaft I5 of the sewing machine. Thepinking attachment is mounted upon a base 22' which is adjustablysecured to the bed plate I0 by suitable means such as a set screw 23.The

the sewing -machine cross section, and is removably secured to the'lower end of a cutter arm by means of aset screw 26. At its upper endthe cutter arm '25 'is pivoted on a pin 21 in the outer'engil',oivagen-tiger Y supporting arm 28, the opposite end of whichzis pivoted at29 to the base 22. Illimanioyablecutter 2i is resiliently urged intocooperative engagement with the cutting edges on the lcdgerblade' v2,0by anadjustable .spring device com prisinJg a flink member i3d, -a-be'll:crank 31 pivoted on a screw 532- extending transversely :through Ithe"cutter, supporting arm 28,y and a coiled fspring'f-313 liavinglfoneendr secured -to vrthe 'bell 1crank"3l and 'itsfother end secured todthe inner end vof ajpin 34v extending outwardly through one Aend of thecutter supporting armff28 andthreaded :on its In-pinkin-g mechanism -ofthe generaltypefto which'fourgijmprovement'is applied, it is essentialthatthe `movable vcutter be reciprocatedin -timed relation vwith ithe`stitching mechanism i of t Y and the `feed mechanism ou-terendtoreceive--afmanuallyoperable adjustemployed therewith. ment Lthereciproca-ting `I notion of the movable cutter-Mis obtained from thedrive shaft li'by means of reduction gearing, ofwhich one ele- 'm'entSBisjsecu-red vto the drive shaft "l5 and 'thek other, 37 is secured totheend` of' a 4j ack shaft k$8 supported in suitable nbearings in ,abracket 'suspended ffromvthe overhanging arm i2. The -gearreductionisfordinarilypa two-to-one ratio, "thusjprovijding'onereciprocation ofYthe movable "cutteril Aforevery Atwo Vreciprocations vof :the needlebarslr 1 Y t, v Y Y -'-The end of the jack shaft oppositegear royidedwith a head4'0 Ahav-inga wristopin ^4`l securedjthereinp A ball head-42'onthecouterend of 'the `wrist pin '4|' engages within a bal'lsocketfini-the *head *'43 of Va pitman structure which transmits motion -tothecutter-supporting arm 26. 'Apitman rod 44 extends downwardly from bthepitmanfheadinto" a socket J45 formed' in a couplingmember J46. Aj ballsocket onthe'iower "endoV of coupling ,4 6 receives av ba1lhead'4`flv on'the f'I'n :the` present irriprove- CII jouter'endloij Ia pin`48threaded into alug49 which Y iprojectsjupwardly from the cuttersupporting amrZ.

A, Thepitman .rod ,44 Vis `*freely'sli'da'ble in the socket^45, and the"means, which we have pro; 'vided for releasably connecting therod '44and `Ithe-coupling member 46 together comprises'a jyoke''ll the sidearms5l of which are pivoted to thecoupling member-"46 'by screws 52.'Y'I'hevloop portion 53 of the yoke may becut away as .shownat1541towpartly -encircle the pitmanjro'd 44 and. ,engage within janotch "55' arranged 'transversely therein; fThefree end of 'the yoke50'is"urged -toward'the pitman rod '44bymeans of a `coiled sprnghavingone yoke and'itspposite'end `'.in contact withja curi/esi aloutment 154zpreiecting' 'outwardly 'from iheigourling msmbcri- :LAS 'will be.apparent from the drawings, when" the loop'portion owf'the end intContactwitn'the Y yoke is in engagement with the notch 55, the pitmanrod 44 and the coupling member 46 will be connected together so that thereciprocating motion of the pitman rod will be transmitted through thecoupling member 46, theY cutter supporting arm 28 and the cutter arm 25to the movable cutter 2 l. When, however, the loop portion of the yokeisl out of engagement with the notch 155, the pitman rod gisvfree toreciprocate in the socket (45 Without imovngftlae coupling member 46therewith.

In order to disengage the yoke from the notch 55, .Wehave provided amanually operated lever "57 straddling the coupling member 46 andpivoted therepnaby Screws 58.

Tziszarranged to be moved upwardly to disconneet the coupling memberfrom the pitman rod, and 'tobe moved downwardly for the purpose offreeinghe yoke to connect the coupling member with the pitman rod. Aswill be clear rom "Figs, h2 fand "13A of the rdrawings,fthe -arms of thewith a' nosef on-the lever-f5 'lftofretainftheyoke :intits'inoperativeposition `whenl the lfree end of l'lever --isgingits rai-sed (position.'Itwill =be apparent Vthat the direction of movement of 4tljie lan-dV-lever 57 -'-to disconnect coupling 4merri- V'ber from 1,the pitmanrod-ythedirectionc fmovementiof themovablecutterwhen itiswinoved outofpingli-ngoperation. v1Movelnentof-j,he-lever downwardly serves -to`release I-theycke for engagement Y with A-the1notch 55 and `therebyopenlatively connect the coupling member to the pit- Vrnanrod.-hisfdownwardgmovementcf the'ihand lever 'is in the same directionfin-.which -ithee'mov- *able cutter moves from inoperative to operati-veposition, This arrangement of the ylever-has been found advantageous tofthe -cperatcr -of--the Virren-brinel inasmuch fasth-edirectionbmovement of the flever `-is-al-ways',indicative of I the-dircction inwhich it is desired to move-thegmovablecutter both into andou-tof Jop'erating-posi-tions.

Whilethe structurejheietcfore-aiescribedeis--one in which-thecuttersupportingarmzeisaositiveiy reciprocated Yboth direci'ions whenLthe-cou#- pling-membegr l'i6 is operatively connected to 4the tpitmanrod 454, additional vmeans "have been provided inthe form/ofa-spiralspring-E-I for-raising the movable cutter Vout Iof-coop'erativefengage- Vment withthesta'tionaryfcutterj-Z when'theccu-4iol-ing"inemiie-r is` 'disconnected from the v^p`ii'frnagri rod.`-"ihedower end ofthe s pringGl-'issupported upon the base' and-its'uppery end-engagesawith the freefendof the cutter supporting armi-28.The swinging movement; of @the cutterfsupporting-arm 2-8 upwardly CJis-llifmited Vby-ay stop rnember2n .the :form oa postrZ44projecting'npwardly from'lthe .base i122 Land. ina-ving its upper 4emii163 angularly bentinto a position to f-contact Vwith :the f cuttersupporting farm slt. is urged upwardly by :the handxlcyerzprbytheosnllngi Y Y .s cinirrsvidesea hqpielil. eperationzmaylbetmeby-aslisht upwardzprssf 'Ilhe free end of the lever' ,on .the hand'lever With notch l55 upon 4into engagement withthe stop 63,andthejmovable, cutter 2l is thus vraised out of engagement with thestationarycutter 20. With the parts in this position, the stitchingoperation alone may be continued. When it is again desired to throw thepinkingy deviceinto operation, this may be done by a slight downwardpressure upon hand lever 51 to move it from the position shown in Fig. 3to the position shown in Fig. 2. When the hand lever is moved downwardlyin this manner, the yoke 50 is free to move under the influence ofspring 56 sothat the loop portion 53 may engage the next movement of thepitman rod to bring the notch into proper position. This position of theparts is illustrated in Fig. 2 of the drawings, and, as will be apparenttherefrom, the reciprocating movements of the pitman rod are transmittedto the movable cutter 2l through the coupling member 45 and thesupporting arm 28. The pinking operation will then be resumed andcontinue simultaneously with the stitching operation until such time asit may again be desired to discontinue it. The improved couplingtherefore provides means whereby the pinking device may be thrown intoand out of operation at will, without interfering with the continuedoperation of the stitching mechamsm.

While certain structural forms of the invention have been disclosedherein, together with the preferred arrangement of the various partswith respect to each other, it is to be understood that the invention isnot intended to be limited to the precise structure and arrangement ofparts as shown and described. The above description and the accompanyingdrawings are therefore to be regarded as illustrative only of the formand arrangement of the various elements of the improvement, and it is tobe understood that the invention is susceptible of other forms andarrangements so long as they come within the scope of the appendedclaims.

What we desire to claim as our invention is:

l. In combination with a sewing machine having stitching means anddriving mechanism therefor, a pinking device including a stationarycutter associated with said stitching means, and a movable cuttercooperating with said stationary cutter, means for reciprocating saidmovable cutter comprising a pitman having one end connected to saiddriving mechanism for reciprocation thereby and its opposite endconnected to said movable cutter, means for automatically urging saidmovable cutter in a given direction out of cooperating engagement withsaid stationary cutter, and manually actuated means movable in saiddirection for disconnecting said pitman from said movable cutter andurging said movable cutter out of cooperative engagement with saidstationary cutter.

2. In combination with a sewing machine having stitching means anddriving mechanism therefor, a pinking device including a stationarycutter associated with said stitching means, and a movable cuttercooperating with said stationary cutter, a pitman having one endconnected to said driving mechanism for reciprocation thereby, acoupling on the opposite end of said pitman for connecting the same withsaid movable cutter and disconnecting the same therefrom, and manuallyoperated means movable in a direction to disconnect said coupling andurge said movable cutter out of cooperative engagement with saidstationary cutter.

3. The combination with a. sewing machine having stitching and' drivingmechanismyof` a pinking device comprising a stationary cutter associatedwith said stitching mechanism, a movable cutter cooperating with saidstationary cutter and arranged for movement out of cooperativeengagement therewith, a pitman interconnecting said driving mechanismand said movable cutter for reciprocating the latter, amanually actuatedcoupling in said pitman for operatively connecting and disconnecting thesame at will, said coupling including a socketmember pivotally connectedto said movable cutter and having a. socket therein for slidablyreceiving the pitman rod, releasablemeans urged in one direction forconnecting-said pitman rod to said socket member, and manually actuatedmeans for urging said releasable means in the opposite direction.

4. A pinking'device` operated by the driving mechanism of a sewingmachine, comprising a stationary cutter, a movable cutter cooperatingtherewith, a pitman rod having its head end connected to said drivingmechanism for reciprocation thereby and having a transversely arrangednotch therein, a coupling member connected t0 said movable cutter by aball and socket joint and having a socket therein to receive theopposite end of said rod with a sliding fit, a latch mounted on saidcoupling member for movement into and out of engagement with said notch,spring means for urging said latch into a position to engage with saidnotch, and manual means for disengaging said latch from said notch.

5. A pinking device operated by the driving mechanism of a sewingmachine, comprising a stationary cutter, a movable cutter cooperatingtherewith, a pitman rod having its head end connected to said drivingmechanism for reciprocation thereby and having a transversely arrangednotch therein, a coupling member operatively connected to said movablecutter by a ball and socket joint and having a socket therein to receivethe opposite end of said rod with a sliding fit, a latch pivoted on saidcoupling member for movement into and out of engagement with said notch,a spring abutment on said coupling member, a spring between-saidabutment and said latch for urging said latch into engagement with saidnotch, and a handle pivoted on said coupling member for movement in onedirection to release said latch from said notch and for movement in theopposite direction to free said latch for actuation by said spring.

6. A pinking device comprising a stationary cutter, a movable cuttersupported for cooperation therewith and for movement out of engagementtherewith, resilient means for urging said movable cutter out ofengagement with said stationary cutter, driving mechanism, a pitman rodhaving its head end connected to said driving mechanism forreciprocation thereby, a coupling member connected to said movablecutter for movement therewith and having a socket therein to receive theopposite end of said rod with a sliding fit, cooperating'means on saidcoupling member and said rod for releasably connecting said couplingmember and said rod together, and manual means on said coupling memberfor rendering said cooperating means ineffective upon movement of saidmanual means in a direction to urge said movable cutter out ofengagement with said stationary cutter.

'7. A pinking device comprising a stationary cutter, a movable cutter,driving mechanism, a coupling member connected to said movable cutter bya universal joint and having a socket therefi'nra pitmanfrod havingtsrheadndconnected eto :said driving mechanism for freciprocaton therebyand :having i'tshnpposi .gend `siiclabiy ireceived iinfs'ai'dsocket,eooperatingfmeansonfsaid -coup1ingmemberend said rodforgreieasabiy con- `5 meeting Isaid .rod and :said coupling member:together, :manual fmeansn said/'coupling member -and movable ain voneV:direction gforiactuating .fsaidcooperatingineansmordiseonnectsaidrodandasaid coupling member awherebyesaid, rod may yreciprocate :in ,said xsiacleiarrand automatic A:meansfor :actuating sai'dcooperatingfmeanso -tconnectsaid frodandfsaidoupling imember ,upommoyement :.saidnotch-.andiormovement inthe .oppositediof aid manualgmeansY-imthe :opposite direction. -rectionto ',ree said `yoke forrmovement by said In a -pinking fdeviee .iforaisewing machiizie, .-15 :springiinto azpositionzto engage I.with:saidnotch. @la ,movableecutteiga.supportotherefnn aspitman :N ."SOBEL.Vmdfinas/'ingariojiehrarranged:transverselytriere- Y f .HERBERT V.JACOBS. n-.and ahead ontoneiend iforattaohmentftofthe Y .v

1a-eeuwse driving mechanism vof @the sewing fmachne,1couplingmemberorv'attachment to said'support .andhaving--a sockettherein to Areceive fthep- .positerend of said -roda yoke-.ha-ingftheireeend of .its iarms tpivoted to ,said. coupling :member :formovement .of the llloop portion thereof into and foutiof. engagementwith. said/notch,` an abutment prog eating outwardlyfrornv-saidcouplingmember, .aspring mounted;between.said=.abutment andisaid `10 yoke, and.La :manually .operated leverpivoted on gsaid J.coupling .member formovementin one rdi- .rectionttourgesaid .yoke .out.of.-engagementmith

